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External Anatomy of the Eye. Lacrimal Apparatus of the Eye. Anatomy of the Eyeball. Fibrous Tunic: Cornea Sclera Vascular Tunic Choroid coat Ciliary Body (Ciliary muscle, Ciliary process) Iris Nervous Tunic Retina. Accessory structures of the Eye from a sagittal view.

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anatomy of the eyeball
Anatomy of the Eyeball
  • Fibrous Tunic:

Cornea

Sclera

  • Vascular Tunic

Choroid coat

Ciliary Body (Ciliary muscle, Ciliary process)

Iris

  • Nervous Tunic

Retina

production of aqueous humor and intraocular pressure
Production of Aqueous Humor and Intraocular pressure
  • Ciliary Process:
  • Produces Aqueous Humor
  • 2. Posterior Chamber:
  • Aqueous Humor flows from
  • this chamber through the
  • pupil in Anterior Chamber
  • Canal of Schlemm
  • Reabsorbs Aqueous Humor
  • Glaucoma:
  • Increase in intraocular
  • pressure due to build up of
  • Aqueous Humor
slide10

Photomicroscopic view of the Histology of the Eye

S = Sclera

C = Choroid coat

PE = Pigmented

epithelium

P = Outer segments

of rods and cones

O = Nuclei of rods and

cones

OPL = Outer synaptic layer

I = Nuclei of bipolar neurons

PL = Inner synaptic layer

G = Ganglion cell layer

slide11

Photomicroscopic view of the Histology of the Eye

showing the location of the central fovea

slide14

Light Refractory

  • Pathway:
  • Bulbar Conjunctiva
  • Cornea
  • Aqueous Humor
  • Lens
  • Vitreous Humor
  • Ganglion Cell Layer
  • Inner Synaptic Layer
  • Bipolar Layer
  • Outer Synaptic Layer
  • Photoreceptor Layer
slide15

Abnormalities of

  • The Eye:
  • Myopic -
  • nearsighted
  • Hypermetropic -
  • Farsighted
  • Presbyopia -
  • age-related failure of
  • lens to accommodate
  • Astigmatism -
  • Distorted vision due to
  • irregular-shaped lens or
  • cornea
  • Color Blindness -
  • genetic defect that
  • causes dysfunction of
  • cones
accommodation of the lens for near vision
Accommodation of the Lens for near vision
  • Ciliary muscles contract
  • Ciliary body pulls forward and inward
  • Tension on suspensory ligaments of lens is decreased
  • Lens becomes thicker (rounder) due to its elasticity
  • Pupils constricts
accommodation of the lens for far vision
Accommodation of the Lens for far vision
  • Ciliary muscles relaxes
  • Ciliary body returns to its resting state, backward and outward
  • Tension on suspensory ligaments of lens is increased
  • Lens becomes thinner (flatter) due to its elasticity
  • Pupils dilate
visual pathway
Visual Pathway
  • Cones
  • Bipolar neurons
  • Ganglion cell’s axon forms the optic nerve
  • Optic nerve to the Optic Chiasm
  • Optic tract
  • Lateral geniculate nuclei of the thalamus
  • Optic Radiations
  • Primary visual areas of the occipital lobes